US4646335A - Apparatus for X-ray photography of the area of the dentition and of the jaws - Google Patents

Apparatus for X-ray photography of the area of the dentition and of the jaws Download PDF

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Publication number
US4646335A
US4646335A US06/696,691 US69669185A US4646335A US 4646335 A US4646335 A US 4646335A US 69669185 A US69669185 A US 69669185A US 4646335 A US4646335 A US 4646335A
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US
United States
Prior art keywords
support arm
rails
structural part
bearing part
ray
Prior art date
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Expired - Lifetime
Application number
US06/696,691
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English (en)
Inventor
Erkki Tammisalo
Heikki Kanerva
Jaakko Aarnio
Markku Wederhorn
Kai Laner
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Instrumentarium Oyj
Original Assignee
Orion Yhtyma Oy
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Assigned to ORION-YHTYMA reassignment ORION-YHTYMA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AARNIO, JAAKKO, KANERVA, HEIKKI, LANER, KAI, TAMMISALO, ERKKI, WEDERHORN, MARKKU
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Assigned to ORION-YHTYMA OYJ reassignment ORION-YHTYMA OYJ CHANGE OF ADDRESS Assignors: OYJ, ORION-YHTYMA
Assigned to INSTRUMENTARIUM CORPORATION reassignment INSTRUMENTARIUM CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OYJ, ORION-YHTYMA
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
    • A61B6/51—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for dentistry

Definitions

  • the present invention relates to an apparatus for X-ray photography of the area of the dentition and of the jaws, and of the type comprising a stationary frame part, a bearing part which is movably mounted to the frame part and preferably performs a linear movement, and a support arm which is rotatably attached using bearings to the bearing part and has at one end a source of X-ray radiation and at the opposite end a movable X-ray film, the movements of the bearing part, the support arm and the film being synchronized in such a way that a sharp image of only an area of the desired shape is obtained on the film, for example the area of the patient's dental arch.
  • the image obtained is not always as sharp as would be desired, especially when some specific part of the dental arch is concerned. It is evident that it is not always possible by means of adjustments to compensate for the variation is the dentition among defferent patients. For example, a situation in which the axis of the rotational movement of the support arm is vertical and the position of at least some of the teeth deviates from the vertical, causes certain blur in the image.
  • the object is in particular to provide such a possibility for tilting the support arm that it will be possible to photograph sharply teeth which are slanted in relation to the vertical plane, without having to change the position of the patient.
  • the support arm is connected to the bearing part by mediation of structural parts which enable the support arm to be tilted about an imaginary axis of inclination, the tilting axis being situated at the level of the patient's head and being perpendicular to the rotational axis, the rotational axis retaining its direction regardless of the tilting.
  • the support arm and at the same time the source of radiation and the X-ray film, can be moved in a direction parallel to the plane of the X-ray beam.
  • this support-arm movement in a direction parallel to the beam, i.e. to the straight line connecting the source of radiation and the film, it is easy to select the enlargement ratio for the image.
  • the support arm When further arrangements are made for the support arm to be able to make a complete rotation, it is possible to allow the source of radiation to pass around either the neck or the face of the patient, without the patient being moved between the operations.
  • FIG. 1 depicts a perspective representation of one embodiment of the X-ray photography apparatus according to the invention, in part exploded for the sake of illustration, and
  • FIG. 2 depicts in a corresponding manner an alternative embodiment.
  • the X-ray apparatus includes a stationary frame, which is indicated in the drawing by reference numeral 1 and which, in addition to the part shown in the drawing, normally includes a vertical pole attached to it and a stand resting on the floor.
  • the protruding part 1 shown in the drawing is, of course, in practice encased, but for the sake of illustration this casing is not shown.
  • a bearing part 2 which is capable of moving in the frame linearly along a horizontal plane and supported by rails 3.
  • the movement is produced by a stepping motor 4, the shaft of which is a screw 5 which works in conjunction with the bearing part 2.
  • a sleeve 6 which is rotatedby another stepping motor 7 by transmission of a cogged belt 8.
  • a casing-like part 9 which thus rotates together with the sleeve 6 and to which there is further attached with bearings in a manner depicted below a support arm 10, which constitutes an essential part of the photography apparatus.
  • a movable X-ray film 11 At one end of the support arm there is a movable X-ray film 11 and at its opposite end source 12 of X-radiation with means for limiting the beam.
  • the support arm 10 performs at least a partial totational movement, the fulcrum moving at the same time linearly together with the bearing part 2, and the head of the patient being located between the source 12 of X-radiation and the X-ray film 11.
  • This arrangement is already so familiar to an expert in the art that it is not described here in greater detail. It is also evident that, as an alternative to the linear shift of the bearing part 2, it is possible to shift the patient, i.e. the chair of the patient, correspondingly during the rotational movement of the support arm.
  • a possibility is provided for moving the support arm in the direction of the arm itself, in other words in a direction parallel to the straight line connecting the source of X-radiation and the film. The last-mentioned movements are implemented as follows.
  • curved guides 13 which work in conjunction with corresponding curved guides 14 in the control part 16.
  • the lower edge of the side piece 23 of the control part 16 has additionally a strip 24, the flat middle section 22 of the support arm 10 being capable of moving supported by the strip.
  • the last-mentioned movement in a direction parallel to the X-ray beam is produced by a stepping motor 19, which rotates a transverse shaft and its cogwheels 20, the cogwheels for their part working in conjunction with cogged bars 21 in the middle section 22.
  • the control part 16 for its part is moved by a screw 18 which grips it in an articulated way, the screw serving as the shaft of the stepping motor r7, which for its part is articulated to the casing part 9 by means of a transverse shaft 15.
  • the motor 17 thus affects the mutual transfer of the guides 13 and 14, and since the guides are curved, the transfer motor 17 of the control part 16 has been suspended in an articulated way.
  • the image enlargement coefficient can be changed by moving the support arm 10 in a direction parallel to the beam, in other words by means of the motor 19. By rotating the support arm 10 180° it is thus possible to allow the source of radiation to travel around either the neck or the face of the patient, and a suitable enlargement coefficient can be produced without shifting the patient.
  • the support arm by means of the motor 17 and the curved rails 13, 14 in the manner described above, at which time it is, of course, advisable also to limit the X-ray beam in the vertical direction by means of a suitable collimator so that the teeth of only the upper jaw or the lower jaw are photographed.
  • the axis of tilting is approximately at the level of the head of the patient 25, the effect is produced that the tilting does not substantially alter the distance of the source of radiation, respectively the film, from the patient, which would occur if the tilting were produced by means of a horizontal transverse axis.
  • the distance of the source and the film to the object remains essentially constant regardless of the described tilting.
  • FIG. 2 One alternative arrangement is shown in FIG. 2.
  • the linear transfer i.e. the transfer in a direction parallel to the plane of the X-ray beam, is produced by means of a plate 26 attached to the sleeve 6, the edges of the plate being guided by rails 28 on the sides of the casing-like part 27.
  • the transfer is effected by means of a motor 29, which is secured to the lower surface of the plate 26.
  • At least the middle section of the support arm 10 is curved in such a way that the center point of the curve, i.e. the tilting axis, is again located approximately at the level of the head of the patient 25.
  • Rollers 30, 31, attached by means of bearings inside the casing 27, work in conjunction with the arch 10, the rollers working against the side, upper and lower surfaces of the arch (the last-mentioned not shown), directing the arch along its own curved line.
  • the transfer movement is produced by means of a spindle motor 32 attached turnably to the casing 27 by means of a shaft 33, the threaded shaft 34 of the motor engaging in a mating piece 35 attached turnably to the side of the arch.
  • the film must also be moved synchronically with the rotational movement of the support arm.
  • the shifting of the film is also produced preferably by means of a stepping motor, although this arrangement is not shown in the drawing.
  • stepping motors are preferably controlled electronically in a manner known per se, especially by means of a programmed or a programmable microprocessor, in which case no mechanical means such as cams or the like are required for mutual synchronization of the movements of the different parts.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Engineering & Computer Science (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Dentistry (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Steroid Compounds (AREA)
US06/696,691 1984-01-02 1985-01-31 Apparatus for X-ray photography of the area of the dentition and of the jaws Expired - Lifetime US4646335A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI840413A FI73361C (fi) 1984-02-01 1984-02-01 Roentgenfotograferingsanordning foer taenderna och hakorna.
FI840413 1984-02-01

Publications (1)

Publication Number Publication Date
US4646335A true US4646335A (en) 1987-02-24

Family

ID=8518470

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/696,691 Expired - Lifetime US4646335A (en) 1984-01-02 1985-01-31 Apparatus for X-ray photography of the area of the dentition and of the jaws

Country Status (10)

Country Link
US (1) US4646335A (fi)
EP (1) EP0151007B1 (fi)
JP (1) JPS60179046A (fi)
AT (1) ATE53478T1 (fi)
AU (1) AU570765B2 (fi)
CA (1) CA1246921A (fi)
DE (1) DE3578115D1 (fi)
ES (1) ES539980A0 (fi)
FI (1) FI73361C (fi)
SU (1) SU1424720A3 (fi)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845767A (en) * 1985-12-16 1989-07-04 Matsushita Electric Industrial Co., Ltd. Image signal processor
US4852134A (en) * 1986-02-04 1989-07-25 Orion-Yhtyma Oy Method and apparatus for radiography of the dental, jaw, and skull regions
US5793837A (en) * 1995-02-08 1998-08-11 Mezhinsky; Victor B. Apparatus and method for X-ray tomography

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0745205Y2 (ja) * 1989-03-31 1995-10-18 株式会社東京エミックス 顎関節撮影用アダプタ
DE102004050172B4 (de) * 2004-08-20 2010-09-02 "Stiftung Caesar" (Center Of Advanced European Studies And Research) 3D-Rekonstruktion mit schräger Geometrie

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670163A (en) * 1969-07-16 1972-06-13 Radiologie Cie Gle Radiological examination apparatus
US3803418A (en) * 1971-07-08 1974-04-09 Siemens Ag X-ray device for investigation of skulls
US4145611A (en) * 1976-12-10 1979-03-20 Den-Tal-Ez Mfg. Co. X-ray source moving mechanism intended for panoramic radiography
US4541293A (en) * 1981-06-23 1985-09-17 Thomson Csf Load-bearing telescopic slide assembly and X-ray installation equipped therewith

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1074211B (de) * 1960-01-28 Siemens-Reiniger-Werke Aktiengesellschaft, Erlangen Röntgenuntersuchungsgerät
US2595260A (en) * 1949-02-05 1952-05-06 F R Machine Works Multiplane X-ray apparatus
JPS52103988A (en) * 1976-02-25 1977-08-31 Morita Mfg Method and device for taking curved sectional plane of xxray
DE2758191A1 (de) * 1977-12-27 1979-06-28 Siemens Ag Zahnaerztliche roentgendiagnostikeinrichtung
US4373361A (en) * 1981-04-13 1983-02-15 Thorneburg James L Ski sock with integrally knit thickened fabric areas
US4534048A (en) * 1983-01-03 1985-08-06 Pennwalt Corporation Methods of increasing anterior layer thickness of continuous dental images obtained through rotational panoramic radiography

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670163A (en) * 1969-07-16 1972-06-13 Radiologie Cie Gle Radiological examination apparatus
US3803418A (en) * 1971-07-08 1974-04-09 Siemens Ag X-ray device for investigation of skulls
US4145611A (en) * 1976-12-10 1979-03-20 Den-Tal-Ez Mfg. Co. X-ray source moving mechanism intended for panoramic radiography
US4541293A (en) * 1981-06-23 1985-09-17 Thomson Csf Load-bearing telescopic slide assembly and X-ray installation equipped therewith

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4845767A (en) * 1985-12-16 1989-07-04 Matsushita Electric Industrial Co., Ltd. Image signal processor
US4852134A (en) * 1986-02-04 1989-07-25 Orion-Yhtyma Oy Method and apparatus for radiography of the dental, jaw, and skull regions
US5793837A (en) * 1995-02-08 1998-08-11 Mezhinsky; Victor B. Apparatus and method for X-ray tomography

Also Published As

Publication number Publication date
ES8602385A1 (es) 1985-12-01
CA1246921A (en) 1988-12-20
FI73361B (fi) 1987-06-30
ES539980A0 (es) 1985-12-01
EP0151007A2 (en) 1985-08-07
EP0151007A3 (en) 1987-03-18
ATE53478T1 (de) 1990-06-15
FI840413A0 (fi) 1984-02-01
AU3799985A (en) 1985-08-08
DE3578115D1 (de) 1990-07-19
EP0151007B1 (en) 1990-06-13
SU1424720A3 (ru) 1988-09-15
FI840413A (fi) 1985-08-02
FI73361C (fi) 1987-10-09
AU570765B2 (en) 1988-03-24
JPS60179046A (ja) 1985-09-12

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